To buy or not to buy, that is the question

OK, I have to admit to a problem with lust. By lust, I mean this definition in the Oxford English Dictionary (there are several others): “Desire, appetite, relish or inclination for something.” What is the object of my inclination? An Apple Macintosh Powerbook G4 15″ laptop. As with so many other things in my life (unfortunately), I’ve become obsessed with buying something that I really don’t need. I want this computer’s wireless capabilities, its excellent operating system (the best in the world, in my opinion), and the ability to access the Internet anywhere in my house and in many other wireless hotspots. I already own an iMac G4, now I want the laptop version, so that I can network them together. Here’s the catch: I don’t have the cash for it. The only way I could buy it would be to charge it to my Apple Instant Loan. We’re talking a cost of about $1,800 for a refurbished laptop direct from Apple ($1,499 by itself) plus a few other things like the new Airport Express base station and Airport Extreme networking cards. Put me out of my misery and help me decide although my conscience is already telling me the right answer. I’m wrestling with the question, To buy or not to buy. What do you think?